wolfendale



(No Model.) 2 Sheets-$11951; l. C. E. WOLFENDALE & G. W. FRITZ. MINING MAHINE.

No. 557,745. Patented Apr. 7, 1895.

E li WHTNESSES INvEn-ros 2 sheets-'S5555 2.

(No Model.) v

C. E. WOLFENDALE &.G. W. FRITZ.

MINING MACHINE.

WITNESSES INVENTORS M 5. www

ANnREw anim/m. PNUTDUNOMASHINGTDN UNITED STATES PATENT OFFICE.

CHARLES E. VOLFENDALE, OF ALLEGHENY, AND GEORGE IV. FRITZ, OF FITTSBURG, PENNSYLVANIA.

MINING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 557,745, dated April 7', 1896.

Application filed July l5, 1895.

To all 111700771/ it may concern:

Be it known that we, CHARLES E. WOLFEN- DALE, of Allegheny, and GEORGE YV. FRITZ, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Mining-Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which- Figure lis a plan view of the cutters, showing our improvement, one of the upper cutters being removed. Fig. 2 is a vertical sectional view on the line II II of Fig. l, Fig. 3 is a side elevation of the same.

Like symbols of reference indicate like parts wherever they occur.

Our invention relates to an improvementI in the Fritz and Boland mining-machine described in Letters Patent No. 536,912; and it consists in an attachment the purpose of which is to support the cutters and to prevent dirt from clogging in the machine and also to aord a more perfectbearing to the cuttingdisks.

IVe will now describe our invention, so that others skilled in the art may manufacture and use the same.

In the drawings# represents the framework of the mining-machine, 3 the journals of the cutter-driving shafts, and a the shafts. On the end of the shafts l are keyed the beveled pinions 5, which mesh with the gear-teeth 6 of the upper cutting-disk 7. On the upper or inner face of the lower cutting-disk S are gearteeth 9, which also mesh with the gear-teeth 6, the upper cutting-disk 7 being inclined to the lower cutting-disk. Extending from the disks 7 and S are the cutting-teeth l0.

Bolted to the frame of the machine is a guard ll, which, extending from the frame, surrounds the space between the two disks '7 and S, so as to prevent any dirt or foreign substance from entering between the two disks. Extending from the inner circumference of the guard-piece ll is the frame or bracket l2, which is provided with bracing arms 13, extending to the inner circumference of the guard-piece. Bolted to the bracket l2 is the socket 14., having in its upper face an Serial No. 555,942. (No model.)

annular recess for the reception of the pivotal or journal bearing-pin l5 of the upper disk 7, which pin is enlarged at its bottom to prevent its jumping and is held in place by the cap 16. The disk is secured to the pin by the washer l 7 and screw-bolt 18. The lower disk S is secured to the guard-piece 14 by means of the washer 19 and screw-bolt 20.

It will be noticed that the guard-piece ll at its base or bearing for the disk S is made as large as possible to afford a rmer support to the cutting-disk and to prevent heating.

In the use of our improved cutter when power is applied to the shafts 4 the pinion 5 meshing with the gear-teeth in the upper disk 7 causes the same to revolve, which in turn imparts motion to the lower cutting-disk S through the gear-teeth 9. Owing to the increase in the size of the journal-pin l5 and the larger bearing of the lower cutting-disk on the socket-piece let, there is much steadier action of the cutting-disk than has heretofore been possible, which steadiness is also increased by the bracket-piece l2. At the same time the guard-piece ll excludes all dirt and foreign substance, which without the guardpiece would soon fill the space between the top and lower disks, so as to prevent the movement of the same.

The advantages of our improvement will be apparent to those skilled in the art.

Having thus described our invention, what we claim, and desire to secure by Letters Patent, is-

l. In a mining-machine the combination of two cutting-disks a driving-shaft meshing with one of said disks, a socket-piece as la provided with an enlarged cavity on its upper surface, said upper cutting-disk being provided with a journal-pin having an enlarged head fitting in said cavity and means for securing the journal-pin in its socket; substantially as described.

2. In a mining-machine the combination with a driving-shaft, and upper and lower disks and bracket as l2, a socket-piece supported by the bracket on one side of which the end of the driving-shaft has a bearing, said socket-piece having an enlarged cavity a journal-pin secured to the upper disk and IOO having an enlarged head itt-ing in said cavity and a cap 16 for holding said enlarged portion in the cavity; substantially as described.

3. In a mining-machine the combination with a driving-shaft, and upper and lower disks, a bracket 12, a socket-piece supported by the bracket on one side of which the end of the driving-shaft has a bearing, said socketpieee having an enlarged Cavity, a journalpin secured to the upper disk and having an enlarged head iitting in said Cavity and a pap 16 for holding said enlarged portion, the 

